Control mechanism for paper-making machines



May 6, 1930. D. E. LEWELLEN CONTROL MECHANISM FOR PAPER MAKING MACHINES Filed April 7,. 1928 2 Sheets.5heet l W Md 2.

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CONTROL MECHANISM FOR PAPER MAKING MACHINES Filed April 7, 1928 2 Sheets-Sheet 2 I mpggmlm snow/14 :0

Patented May 6, 1930 I UNITED sTATes DARCY n. LEWELLEN, or COLUMBUS, INDIANA CONTROL MECHANISM FOR PAPER-MAKING MACHINES Application filed April 7,

My invention relates to control mechanism for paper making machines and is designed to control the paper in response to variations in the weight of the paper as it passes through the machine. it

In a copendingapplication of D. E. Lewellen'and Granville R. Zecher Serial No. 272,- 255, filed April 23, 1928, is disclosed a complete pa er making machine having a controlling evice responsive to variations in the thickness of the paper to control the supply of paper stock to the machine in order to keep the paper within predetermined limits of thickness. The device, shown in the instant application, is designed to be used with a control mechanism similar to that shown in the above referred to copending application in which the gaging device in this application operates to control the supply of paper stock in response to variations in the weight a of the paper as the paper passes through the machine. The gaging device in this aplication is designed to replace the calipermg device of the above referred to application.

Since all parts of the control mechanism are the same, they will not be described in this application but reference may be had to the former application for a full understanding of the machine. The description in this application will be limited to the specific gaging device which is responsive to variations in the weight of the paper.

Referring to the accompanying drawing which is made a part hereof and on which similar reference characters indicate similar parts,

Figure 1. is a side elevation showing the complete gaging device.

Figure 2 is an enlarged detail view of the impulse device, and

Figure 3 is a section on line 3-3 of Fig.2. In the drawing numeral 10 indicates a ase which may be positioned on the paper ma chine intermediate the last pressing roll 11 and the drying rolls 12. An upright post 13 is positioned on the base and carries on its upper end a roll 14 revolvably mounted thereon. Positioned on the post 13 below the roll 14 is a similar roll 15. An arm 16 pivoted at '1928. Serial No. 268,187.

the axis of the roller 14 carries on its outer end a roll 17. The arm has a rearwardly extending portion 18 upon which is mounted a weight 19 designed to balance the weight of the roll 17. Stop screws 20 and 21 limit the swinging movement of the arm 16. Bigidly attached to the rear arm 18 is a depending arm 22 which is bent at right angles as shown at-23 and has on its end a contact point 24 insulated from the rest of the arm. The 0 lower part of the arm has a graduated scale 25 thereon and a movable weight 26.

A plate 27 is secured upon the standard 13 and carries contact plates 28, 29 and 30. These .contact plates are connected with wires 31, 32 and 33 respectively. The contact point 24 has connected thereto a wire '34. Mounted on an arm 35 on the standard 13 is the control box 36 which corresponds to the control mechanism described in the copending application above referred to. g

A cam 37, connected through suitable gear ing with the roller 15, is rotated counterclockwise to rock an arm 38. This arm has contact points 39 and 40 to which are connected wires 41 and 42. A lever 44 is pivoted upon depending brackets 45 secured upon the lever 38. The lever 44 has an enlarged or weighted end 46 which strikes against the end of a screw 47 in certain positions of the lever 38, to hold the points 39 and 40 out of contact. The screw 47 is carried by a bracket 48 and is prevented from turning in the bracket by means of a screw. 49. A bevel gear 50 is positioned in the upper side of the bracket 48 and held against axial movement therein by means of a screw. 51. The member 50 is internally threaded to receive the screw 47. The bevel gear 50 may be rotated by means of a bevel gear 52. The gear 52 may be manually operated by means of a knob 53. It will be readily seen from Fig. 3 that rotation of the knob 53 will rotate the bevel gear 50 to raise or lower the screw 47 The vertical position of the screw 47 moreover determines the length of time during which the contacts 39 and 40 are together during a revolution of the cam 37, as more fully described in the copending application above referred to.

As described in the above referred to application, the motor which operates the stock gate on the machine cannot operate unless the points 39 and are in contact. In operation of the machine these contacts are. made and broken at regular intervals. The wires 31, 32 and 33 correspond to wires leading to relays which operate switches to energize a motor which operates the feed gate to control delivery of paper stock to the machine. Numeral 54 indicates the motor which drives mechanism for opening and closing a stock gate 55. The motor and stock gate are preferably such as shown in the co-pending application above referred to.

The operation of the device is as follows: A strip of paper 43, passing from the last of the pressing rolls 11, passes over the roll 14, out over the roll 17 on the outer end of the arm 16 and back around the roll 15 thence to the drying roll 12. The weight 19 is adjusted on the arm 18 so that the arm 16 with the roll 17 will just be balanced before the strip of paper is started over the rolls. A strip of paper 43 of the desired weight per square unit is then passed over the roll 14 out over the roll 17, back around the roll 15, thence to the drying roll. 12. The weight 26 is then adjusted so as to hold the arm 17 evenly balanced when the paper'of the required weight is passing over or is resting upon the rolls. The contact 24 should then be on 29 as shown in the drawing. The graduated scale 25 will indicate the weight of the paper .per square unit. weight of the paper will rock the arm 16 on its pivot and swing the arm 23 to move the contact 24 across the contact, points 28, 29

or 30. When paper of the required weight is passing over the rolls the weight 26 will be adjusted so as to position the contact 24 upon the contact plate 29.

If paper heavier than that desired passes over the rolls, its weight will swing down the arm 16 to move the contact 24 in engagement withsthe contact point 28. Through suitable wiring mechanism, described in the application referred to, a red light will show and the motor will be energized to decrease the amount of stock delivered to the machine and thus decrease the weight of the paper which is being made.

if the strip of paper passing over the rolls is lighter than that desired, the arm 16 will swing up and move the contact point 24 to engage the contact point 30 to operate a motor to increase the suppl of paper stock to the machine to increase t e weight of the paper. I

The weight gaging device, just described, operates in connection with the controlling device shown as a whole on the 'plate 36; that is, the motor is energized to operate the stock gate by impulses, the durationof which depends on. the control device described in the companion application previously mentioned.

Any variation in the That is, the motor will not be operated except when contact points 39 and 40 are closed.

While I have shown and described my device as operating in a paper making machine, it should be understood that the invention is not limited to that use. Obviously it may be used in other relations to regulate the amount of material fed to the machine in response to variations in the weight of the finished product.

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and I, therefore, do not limit myself to' what is shown in the drawing anddescribed in the specification, but only as set forth in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a paper machine, means operated when the weight of the paper overrides predetermined limits adapted to close circuits to cause operation of means to vary the weight of the paper, and means limiting the operation of the control means to predetermined intervals and predetermined duration, substantially as set forth.

2. In a paper making machine, a device responsive to variations in the'weight of the paper passing through the machine comprising a pivoted arm, a roller on said arm, an arm carrying a contact point, a series of cooperating contacting points engageable by the contact point on said arm to close a circuit forthe purpose described, substantially as set forth.

3. In a paper making machine, a controlling device for keeping the weight of the paper within predetermined limits comprising a gage mounted on the machine at a point where the paper is sufficiently formed to determine its weight, means controlling a portion of the means to vary the amount of paper making material fed to the machine controlled by the said gage, substantially as set forth.

4. In a paper machine a controlling device comprising a gage responsive to variations in the weight of the paper, and means to vary the amount of paper stock fed to the machine, said means being controlled by the said gage, substantially as set forth.

5. In a paper machine a controlling device for keeping the weight of paper Within predetermined limits comprising a gage operable by variations in the weight of paper, and means controlled by said gage for controlling a portion of the means to vary the amount of material fed to the machine, substantially as set forth.

6. In a paper machine having a stock gate and a motor for operating the same, means for controllin the stock gate comprising a gage operable liy variations in the weight of the paper, an electric circuit, means operable by the said gage for controlling the circuit to cause operation'of the stock gate to vary the amount of stock fed to the paper ma chine, substantially as set forth.

7. In a paper machine, a gage operable by variations in the weight of the paper passing over the gage, an electric circuit in control of means for varying the amount of stock delivered to the machine, and means operable by the said gage for controlling the said circuit, substantially as set forth.

8. In a paper machine in combination a gaging device responsive to variations in the weight of the paper passing through the machine, and an electric circuit in control of means for supplyin paper stock to the machine, said circuit eing controlled by the said gaging device, substantially as set forth. 9. In a paper machine, a gaging device adapted to respond to variations in the weight of the paper passing through the machine, an electric circuit in control of means for vary ing the supply of paper stock fed to the ma-- chine, the said circuit being controlled by the said gaging device, and additional means for periodically opening and closing the said circuit, substantially as set forth.

10. In a paper machine having a stockgate for regulating the amount of stock fed to the machine, the combination of a gaging device responsive to changes in the weight of the paper, an electric circuit in control of means for operating the stock gate, the said circuit being controlled by the said gaging device, and additional means for closing the said circuit to' cause the means for operating the stock gate to operate during predetermined durations when the circuit is closed by the said gaging device, substantially as set forth.

11. In a paper making machine having a stock gate for regulting the amount of stock fed to the machine, the combination of a weight responsive device with means; for closing a circuit for operating means for moving the stock gate, and means for intermittently opening and closing the circuit, substantially as set forth. 12. In a paper machine, means operable by the paper when the weight of the paper overrides predtermined limits, adapted to close circuits to cause operation of means to decrease the amount of stock fed to the machine to decrease the weight of the paper, substantially as set forth.

13. A control device comprising a gage re sponsive to variations in the weight of the material issuing from a machine,in control of circuits for operating mechanism for varying the amount of stock fed to the machine substantially as set forth.

14. In a machine for making sheet material, a gage responsive to variations in the weight of the finished sheet in combination with means for controlling operationof the 

